Conclusions
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1.
12Kh2MFSR steel is a steel of the bainitic type. In this steel the equilibrium carbide phases are the vanadium carbide VC and the chromium carbide M7C3.
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2.
A change in the normalization temperature from 980 to 1080°C has little influence on the hardness, the tensile strength, and the impact strength. An increase in the normalization temperature to 1130°C decreases the ductility of the steel and increases the scattering of the values of impact strength.
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3.
Tempering at temperatures up to 650°C inclusively is insufficient for the formation of equilibrium carbide phases even when the tempering time is 25 h. Tempering at 700–780°C ensures the formation of equilibrium carbide phases; the strength is determined by the size and shape of the ferrite grains and also by the type of distribution of the carbides.
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Literature cited
K. Irvine and F. Pickering, “Journal of the Iron and Steel Institute” (1957), Vol. 186.
V. S. Teplov, Heat Treatment of Welded Articles of Complex Alloyed Steels [in Russian], GOSINTI (1963), No. 7-63-788/27.
E. Smith and I. Nutting, “Journal of the Iron and Steel Institute” (1957), Vol. 187.
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 1, pp. 52–57, January, 1966
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Teplov, V.S., Ul'yanova, N.V. Structure, phase composition, and mechanical properties of 12Kh2MFSR steel. Met Sci Heat Treat 8, 57–61 (1966). https://doi.org/10.1007/BF00660166
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DOI: https://doi.org/10.1007/BF00660166